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Kris Van Steenbergen proslijedio/la je Tweet
NEW STUDY: Permafrost thaw's contribution to climate change may be *double* what we once thought. Top Arctic scientists spent years figuring it out. And they call the estimate conservative. It's not getting much attention. It should. My
@natgeo story (1)https://www.nationalgeographic.com/science/2020/02/arctic-thawing-ground-releasing-shocking-amount-dangerous-gases/ …Prikaži ovu nitHvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
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The thing I want to tell about warmth sneaking into the fjords of Southeast Greenland... … seems a simple story: - a lack of sea ice in the bays - warm currents at the surface & at the deepest layers - cold surface flows (downstream) - warm underflows (upstream) - unstoppablepic.twitter.com/xtl1AeyMcS
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I was thinking: The Sermilik system (Helheim glacier, Fenris Glacier & Midgard Glacier) & the Kangerlussuaq Fjord are both good indicators of what is about to happen to the southern glaciers. Open water at both fjords (in January) suggests there's something changed permanently.
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--- Pine Island Glacier --- Its glacier tongue is about to lose an even bigger part than we thought: 750 to 1000 km² ???pic.twitter.com/cBpAocUbES
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--- Southeast Greenland --- marine glaciers are accelerating (50 to 240 m/day in January!) reasons (coupled one-on-one): - lack of sea ice - ocean warming (deep layers) - dark surface (rock & sand) - changing currents - warm underflow (ice tongues) - snowfall upstreampic.twitter.com/8Bm43AekA9
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--- Academy of Science Ice Cap --- --- Schmidt Ice cap --- --- Ushakov Island --- --- Arctic Ice Cap --- --- Vize Island ---pic.twitter.com/INL7DArshK
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--- Bernstorff glacier --- - Southeast Greenland - From only 10 m/day in May 2019 to > 200 m/day in January 2020!! The entire eastern region of Greenland is warming anomalous fast from beneath. Warm underflows are accelerating all the marine glaciers.pic.twitter.com/bep2FBlLGi
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--- Pine Island --- - glacier tongue - anytime now!pic.twitter.com/GlayIhDezE
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Kris Van Steenbergen proslijedio/la je Tweet
...Collectively, the region contains enough vulnerable ice to raise global sea level by 1.2 meters (4 feet).https://earthobservatory.nasa.gov/features/pine-island …
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Because of all this they are losing contact with the land & the sea-bed. The southern ice cap of Greenland is resting entirely on land!
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This melt, generated in the northern hemisphere, causes inforced raises of the Antarctic ice shelves & glacier tongues (PIG & TG for example). These ice shelves are already getting thinner 365 days per year due to ocean heat, surface melt & thinning sea-ice (losing protection).
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--- Pine Island glacier --- Ice tongue... Newest cracks... Accelerating front... Losing grip & stability...pic.twitter.com/ZhS42IcR1e
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I'll try to update every 10 days or so, because this is way too important to ignore. This fjord system is able to drain a huge part of the southern area of the ice sheet and to generate several mm's of SLR per month. This region consists of ice resting on land above sea level!
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It's very disturbing this is happening already in January. These fjords were frozen solid in the recent past during the three coldest seasons. Open water only occurs in July or August under normal conditions. Some nasty preconditions. Melt season starts in about two months!
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South Greenland is warming rapidly. This is how it came out of the winter darkness. The ice cap is flowing to the sea at an enormous rate through several fjords (not frozen). 200.000 km² drained by a dozen glaciers. 1-3 Gt/day run-off in cooperation with Eqalorutsit glacier.pic.twitter.com/VP0H3s4jR9
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--- Eqalorutsit glacier --- - Nordre Sermilik fjord - -- West of Narsarsuaq -- - southwest Greenland - We didn't see this coming! 12 to 15 m/day during wintertime! Could this be the new fastest glacier of Greenland? This fjord seems able to drain a huge part of the ice sheet.pic.twitter.com/SwQaCzGNWv
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